[Ethereal49]

Problem

With Lightpanda 1.0.3 attached over CDP, --restore saves both a cookie and localStorage on the first close. Reopening the session restores the cookie, but Lightpanda does not implement DOMStorage.setDOMStorageItem. The CLI reports loaded without a reason, and the next close overwrites the snapshot with origins: [].

Changes

• Keep writing storage through CDP where supported. When an origin cannot be restored, report the origin and the reason in CLI and MCP output. The existing skipped-origin arrays remain available.
• Report loaded_partial when storage is skipped. With the default --restore-save auto policy, keep the original snapshot after a partial restore.
• Document the JSON diagnostics and save policy.

Verification

• The mock CDP regression failed on the baseline and passes with this change. It covers successful DOMStorage writes and an unsupported method.
• Reproduced the issue with the official Lightpanda 1.0.3 macOS ARM64 binary over external CDP. Verified that the cookie returns, CLI stderr and MCP report the skipped origin and reason, and a second close preserves the original snapshot.
• Targeted Rust tests and four real-Chrome state and restore tests passed.
• Docs tests, type check, production build, and route tests passed.

NOT_RUN: The exact Debian 13 Crostini environment and the full Rust suite.

Fixes #2543.

Implemented with Codex (AI-assisted).

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